<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * This library grabs the names and values of the variables sent or posted to a
 * script in $_GET, $_POST and $_FILES superglobals and sets simple globals 
 * variables from them. It does the same work for $HTTP_ACCEPT_LANGUAGE and 
 * $HTTP_AUTHORIZATION.
 *
 * @version $Id: grab_globals.lib.php 11335 2008-06-21 14:01:54Z lem9 $
 */
if (! defined('PHPMYADMIN')) {
	exit;
}

/**
 * copy values from one array to another, usally from a superglobal into $GLOBALS
 *
 * @uses	$GLOBALS['_import_blacklist']
 * @uses	preg_replace()
 * @uses	array_keys()
 * @uses	array_unique()
 * @uses	stripslashes()
 * @param   array   $array	  values from
 * @param   array   $target	 values to
 * @param   boolean $sanitize   prevent importing key names in $_import_blacklist
 */
function PMA_recursive_extract($array, &$target, $sanitize = true)
{
	if (! is_array($array)) {
		return false;
	}

	if ($sanitize) {
		$valid_variables = preg_replace($GLOBALS['_import_blacklist'], '',
			array_keys($array));
		$valid_variables = array_unique($valid_variables);
	} else {
		$valid_variables = array_keys($array);
	}

	foreach ($valid_variables as $key) {

		if (strlen($key) === 0) {
			continue;
		}

		if (is_array($array[$key])) {
			// there could be a variable coming from a cookie of
			// another application, with the same name as this array
			unset($target[$key]);

			PMA_recursive_extract($array[$key], $target[$key], false);
		} else {
			$target[$key] = $array[$key];
		}
	}
	return true;
}


/**
 * @var array $_import_blacklist variable names that should NEVER be imported
 *							  from superglobals
 */
$_import_blacklist = array(
	'/^cfg$/i',		 // PMA configuration
	'/^server$/i',	  // selected server
	'/^db$/i',		  // page to display
	'/^table$/i',	   // page to display
	'/^goto$/i',		// page to display
	'/^back$/i',		// the page go back
	'/^lang$/i',		// selected language
	'/^convcharset$/i', // PMA convert charset
	'/^collation_connection$/i', //
	'/^set_theme$/i',   //
	'/^sql_query$/i',   // the query to be executed
	'/^GLOBALS$/i',	 // the global scope
	'/^str.*$/i',	   // PMA localized strings
	'/^_.*$/i',		 // PMA does not use variables starting with _ from extern
	'/^.*\s+.*$/i',	 // no whitespaces anywhere
	'/^[0-9]+.*$/i',	// numeric variable names
	//'/^PMA_.*$/i',	  // other PMA variables
);

if (! empty($_GET)) {
	PMA_recursive_extract($_GET, $GLOBALS);
}

if (! empty($_POST)) {
	PMA_recursive_extract($_POST, $GLOBALS);
}

if (! empty($_FILES)) {
	$_valid_variables = preg_replace($GLOBALS['_import_blacklist'], '', array_keys($_FILES));
	foreach ($_valid_variables as $name) {
		if (strlen($name) != 0) {
			$$name = $_FILES[$name]['tmp_name'];
			${$name . '_name'} = $_FILES[$name]['name'];
		}
	}
	unset($name, $value);
}

/**
 * globalize some environment variables
 */
$server_vars = array('HTTP_ACCEPT_LANGUAGE', 'HTTP_AUTHORIZATION');
foreach ($server_vars as $current) {
	// it's not important HOW we detect html tags
	// it's more important to prevent XSS
	// so it's not important if we result in an invalid string,
	// it's even better than a XSS capable string
	if (PMA_getenv($current) && false === strpos(PMA_getenv($current), '<')) {
		$$current = PMA_getenv($current);
	// already imported by register_globals?
	} elseif (! isset($$current) || false !== strpos($$current, '<')) {
		$$current = '';
	}
}
unset($server_vars, $current, $_import_blacklist);

?>
